Nakuba kungase kubonakale njengento encane, izinto ze-O-ring ze-valve zibaluleke kakhulu. Izinto zinganquma ukubekezelela izinga lokushisa kwe-seal. Futhi zinikeza i-seal ukumelana namakhemikhali, kanti ezinye izinhlobo zerabha ziyahambisana noketshezi oluhlukene. Izinto ezimbili ezivamile zama-valve ebhola e-union yangempela yi-Viton ne-EPDM.

I-Viton (esithombeni ngakwesokudla) iyirabha yokwenziwa enokumelana okuphezulu kwamakhemikhali kanye nokushisa. I-EPDM imele i-Ethylene Propylene Diene Monomer futhi inezakhiwo zayo ezenza ibe yinto ethandwa kakhulu ye-O-ring. Uma uqhathanisa i-Viton ne-EPDM, izici eziningana kumele zicatshangelwe: ukubekezelela izinga lokushisa, ukuhambisana kwamakhemikhali, kanye nezindleko. Qhubeka ufunda ukuze uthole ukuqhathanisa okugcwele.

Izimpawu zerabha ze-EPDM
Irabha ye-EPDM (irabha ye-EPDM) iyirabha eyinkimbinkimbi futhi engabizi kakhulu enezinhlobo eziningi zokusetshenziswa. Ngokuvamile isetshenziselwa ukuvikela uphahla ngoba i-EPDM ivala kahle. Futhi iyinto evamile yokuvala amafriji ngoba iyisivikelo futhi inokumelana okuhle kakhulu nokushisa okuphansi. Ngokukhethekile, i-EPDM isebenza kahle ebangeni lokushisa eliphakathi kuka--49F no-293F (-45C kuya ku-145C), okwenza ifaneleke ukusetshenziswa kunoma yiliphi izinga lokushisa.

Nakuba amarabha amaningi emelana nokushisa okuphezulu, ambalwa kuphela angamelana nokushisa okuphansi njenge-EPDM. Lokhu kwenza kube ukukhetha kokuqala kunoma ubani ozama ukuvala ezindaweni ezibandayo noma ngezinto ezibandayo. Ama-True Union Ball Valve ane-EPDM Sealed O-Rings Izicelo ezijwayelekile ze-EPDM zifaka phakathi ukufakelwa kukagesi, ama-linings echibi, amapayipi, abaqoqi bamaphaneli elanga, ama-O-rings, nokuningi.

Ngaphezu kokubekezelela amazinga okushisa aphezulu, i-EPDM inokumelana okukhulu kwamakhemikhali. Lokhu kufaka phakathi amanzi ashisayo, umusi, insipho, izixazululo ze-caustic potash, izixazululo ze-sodium hydroxide, uwoyela/amafutha e-silicone, kanye namanye ama-asidi namakhemikhali amaningi axutshwe. Ayifanele ukusetshenziswa nemikhiqizo yamafutha amaminerali njengamafutha okugcoba, uwoyela noma amafutha. Ukuze uthole ukuhambisana kwamakhemikhali athile kwe-EPDM, chofoza lapha. Lezi zakhiwo ezihlaba umxhwele, zihlanganiswe nentengo yayo ephansi, zenza i-EPDM ibe yinto ethandwa kakhulu yokuvala.

Izimpawu ze-Viton
I-Viton iyirabha yokwenziwa kanye ne-fluoropolymer elastomer. Igama elithi “Fluoropolymer” lisho ukuthi le nto inokumelana okuphezulu nezinyibilikisi, ama-acid kanye nezisekelo. Igama elithi “elastomer” lingashintshaniswa ngokuyisisekelo nelithi “irabha”. Ngeke sixoxe ngomehluko phakathi kwe-elastomer nerabha lapha, kodwa sizoxoxa ngalokho okwenza i-Viton ibe ekhethekile kangaka. Le nto ivame ukubonakala ngombala oluhlaza noma onsundu, kodwa okuyenza ihluke ngempela ubuningi bayo. Ubuningi be-Viton buphakeme kakhulu kunezinhlobo eziningi zerabha, okwenza i-Viton seal ibe ngeyodwa enamandla kakhulu.

I-Viton inobubanzi bokubekezelela amazinga okushisa kusukela ku--4F kuya ku-410F (-20C kuya ku-210C). Amazinga okushisa aphezulu i-Viton engawamelana nawo enza kube kuhle kakhulu ekusetshenzisweni kwamazinga okushisa aphezulu. I-Viton ivame ukusetshenziswa kuma-O-rings, amagilavu ​​​​angangeni makhemikhali kanye neminye imikhiqizo ebunjiwe noma ekhishwe ngaphandle. Ama-O-rings enziwe nge-Viton alungele ukuntywila nge-scuba, izinjini zezimoto kanye nama-valve ahlukahlukene.

Uma kukhulunywa ngokumelana namakhemikhali, i-Viton ayinakuqhathaniswa. Imelana nokugqwala okuvela ezinhlobonhlobo eziningi zoketshezi namakhemikhali kunanoma iyiphi i-elastomer engena-fluorinated. Ngokungafani ne-EPDM, i-Viton iyahambisana namafutha, amafutha, izinto zokugcoba kanye nama-asidi amaningi angaphili. Imelana kakhulu nokucindezelwa, ukushiswa komoya, ukukhanya kwelanga, isimo sezulu, amafutha emoto ane-oxygen, ama-aromatics, isikhunta, isikhunta, nokunye. Imelana kakhulu nokushiswa ngokwemvelo kunezinye irabha eziningi. Funda kabanzi mayelana nezinto okufanele zenziwe kanye nezinto okufanele zenziwe ngamakhemikhali e-Viton.

Inkinga enkulu nge-Viton yintengo yayo. Ekukhiqizeni, kubiza cishe izikhathi eziphindwe kasishiyagalombili ukukhiqiza inani elifanayo lezinto ezibonakalayo njenge-EPDM. Uma uthenga umkhiqizo oqukethe inani elincane lalezi zinto zerabha, intengo ingase ingashintshi kakhulu. Kodwa uma u-oda ngobuningi, ungalindela ukuthi izingxenye ze-Viton zibize kakhulu kune-EPDM.

Izimpawu ze-Viton neze-EPDM
Ishadi Lerabha Lokuvala I-Viton vs EPDM

Ngakho-ke iyiphi into engcono kakhulu? Le mibuzo ayilungile ngokuphelele. Zombili izinto zinezinhlelo zokusebenza ezithile lapho zilungele khona, ngakho konke kuncike emsebenzini abazowenza.Amavalvu Okuhlola Amabhola e-CPVCfuthiAmavalvu Okuhlola Ukujika kwe-CPVCzitholakala ngezimbobo ze-Viton noma izimbobo ze-EPDM. Lezi zimbobo zenziwe ngama-O-rings afakwe ezingxoxweni. Lawa ma-valve aklanyelwe ukuhlukaniswa kalula ukuze kube lula ukuwalungisa, ukuze abe nemizimba esuswayo.

Uma udinga ivalvu yesistimu yamanzi, kungakhathaliseki ukuthi izinga lokushisa lingakanani, ivalvu ene-EPDM seal ivame ukuba yisinqumo esingcono kakhulu. Ngaphandle kokubekezelela izinga lokushisa okuhlukile kancane, umehluko omkhulu phakathi kwezinto ezimbili ukumelana kwazo namakhemikhali. I-Viton ilungele ukusetshenziswa nophethiloli nezinye izinto ezigqwalisayo, kodwa uma ubhekene nento engenangozi njengamanzi, lokhu kuqina okukhulu akudingeki.

I-Viton ilungele uma ufuna ukuqina okuphezulu ezimweni ezicindezelayo. Njengoba kushiwo ngaphambilini, i-Viton iyanamathela cishe kunoma yiluphi uhlobo lokugqwala kanye ne-asidi. Nakuba i-EPDM ngokwayo iqinile kakhulu, ayikwazi ukulingana ne-Viton ekumelaneni namakhemikhali kuphela.

Kulesi sihloko, besiqhathanisa izinto ezimbili: i-Viton vs i-EPDM, yikuphi okungcono? Impendulo iwukuthi akukho "okungcono" kunenye. Zonke ziyizinto ezisezingeni eliphezulu ezinokusetshenziswa okungapheli. Uma kufanele ukhethe phakathi kwazo, bheka amazinga okushisa ozowabona kuzo, amakhemikhali ozowabona kuwo, futhi okubaluleke kakhulu, isabelomali sakho. Qiniseka ukuthi uthola ivalvu oyidingayo ngentengo engenakuqhathaniswa!